Seasonal distribution and abundance of earthworms (Annelida: Oligochaeta) in relation to the edaphic factors around Udupi Power Corporation Limited (UPCL), Udupi District, southwestern coast of India

Main Article Content

T.S. Harish Kumar
http://orcid.org/0000-0003-1053-9272
M. Siddaraju
http://orcid.org/0000-0003-4203-9408
C.H. Krishna Bhat
http://orcid.org/0000-0002-2637-1243
K.S. Sreepada
http://orcid.org/0000-0001-5971-5148

Abstract

Seasonal distribution and abundance of four species of earthworms belonging to three families—Rhinodrilidae (Pontoscolex corethrurus), Megascolecidae (Megascolex konkanensis and Metaphire houlleti) and Octochaetidae (Karmiella karnatakensis)—were studied in three habitats (residential, agricultural and forest) along with edaphic factors around Udupi Power Corporation Limited (UPCL), Karnataka, India between September 2014 and August 2016.  Among the four species, P. corethrurus was collected throughout the year and was most abundant in residential habitats such as colacasia garden, coconut and banana pits.  M. konkanensis was collected from coconut plantations, banana plantations and forest soil during monsoon and post-monsoon periods.  M. houlleti was collected from manure heaps, coconut and banana pits of residential habitat, coconut plantations and forest soil.  K. karnatakensis was collected from garden soil in residential habitat during the post-monsoon period, coconut plantations and soil mixed with forest leaf litter during monsoon and post-monsoon periods.  The soil temperature differ significantly during different seasons in residential (P= 0.01) and agricultural (P=0.03) habitats whereas moisture shows highly significant difference in agricultural habitat (P=0.00037) during different seasons.  P. corethrurus showed positive correlation with organic carbon during pre-monsoon and C/N ratio during monsoon in the residential habitat.  It shows negative correlation with pH during the monsoon period.  M. houlleti showed positive correlation with organic carbon in residential habitat during the pre-monsoon and in forest habitat during monsoon periods.  M. konkanensis showed positive correlation with electrical conductivity in agricultural habitats during monsoon period.  K. karnatakensis showed positive correlation with moisture during monsoon and with C/N ratio during post-monsoon period in forest habitats.

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Communications

References

Ahmed, S. & J.M. Julka (2017). First record of exotic earthworm, Amynthas hupiensis (Michaelsen, 1895) (Oligochaeta: Megascolecidae), from India. Megadrilogica 22(7): 151–154.

Begum, R. & S.A. Ismail (2004). Illustration of earthworms occurring in and around Chennai, India. Journal of Threatened Taxa 19(3): 1394–1400; http://dx.doi.org/10.11609/JoTT.ZPJ.19.3.1394-400

Bhadauria, T., P.S. Ramakrishnan & K.N. Srivastava (2000). Diversity and distribution of endemic and exotic earthworms in natural and regenerating ecosystems in the central Himalayas, India. Soil Biology and Biochemistry 32: 2045–2054.

Biradar, M.D., B. Suresh, M. Siddaraju, K. Sreepada, R. S. Giraddi, R. Paliwal & P.B. Gai (2013). Genetic diversity of earthworms from Western Ghats of Karnataka (India) using RAPD based molecular markers. Biochemical and Cellular Archives 13(2): 237–242.

Bisht, R., H. Pandey, D. Bharti & B.R. Kaushal (2003). Population dynamics of earthworms (Oligochaeta) in cultivated soils of Central Himalayan tarai region. Tropical Ecology 44(2): 229–234.

Blakemore, R.J. (1994). Earthworms of South-East Queensland and their agro-economic potential in brig low soils. PhD Dissertation, University of Queensland, 605pp.

Blakemore, R.J. (2000). Native earthworms (Oligochaeta) from southeastern Australia, with the description of fifteen new species. Records of the Australian Museum 52(2): 187–222.

Blakemore, R.J. (2004). Checklist of Japanese earthworms updated from Easton (1981), pp. 155–162. In: Moreno, A.G. & S. Borges (eds.). “Avances en Taxonomia de Lombrices de tierra / Advances in Earthworm Taxonomy (Annelida: Oligochaeta)â€. Editorial Complutense, Universidad Complutense, Madrid, Spain, 415pp.

Blakemore, R.J. (2006). Cosmopolitan Earthworms - An Eco-taxonomic Guide to the Peregrine Species of The World. Verm Ecology, Yokohama, Japan, 650pp.

Blakemore, R.J. & M. Paoletti (2006). Australian earthworms as a natural agroecological resource. Annals of Arid Zone 45(3&4): 1–22.

Blanchart, E. & J.M. Julka (1997). Influence of forest distribution on earthworm (Oligochaeta) communities in the Western Ghats (south India). Soil Biology and Biochemistry 29: 303–306.

Brown, G.G., B. Pashanasi, C. Villenave, J.C. Patro’n, B.K. Senapati, S. Giri, I. Barois, P. Lavelle, E. Blanchart, R.J. Blakemore, A.V. Spain & J. Boyer (1999). Effects of earthworms on plant production in the tropics, pp. 87–147. In: Lavelle, P., L. Hendrix & P. Hendrix (eds.). Earthworm Management in Tropical Agroecosystems. CABI Publishing, Oxon, UK, 300pp.

Chamberlain, E.J. & K.R. Butt (2008). Distribution of earthworms and influence of soil properties across a successional sand ecosystem in NW England. European Journal of Soil Biology 44: 554–558.

Chanabun, R., K. Inkavilay & S. Panha (2017). New species of semi-aquatic freshwater earthworm genus Glyphidrilus Horst, 1889 from Thailand and Laos (Oligochaeta, Almidae). Zoo Keys 672: 1–34.

Chaudhuri, P.S., S. Nath & R. Paliwal (2008). Earthworm population of rubber plantations (Havea brasiliensis) in Tripura, India. Tropical Ecology 49(2): 225–234.

Chhonkar, P.K., S.P. Datta, H.C. Joshi & H. Pathak (2000). Impact of industrial effluents on soil health and agriculture-Indian experience: Part I - Distillery and paper mill effluents. Journal of Scientific and Industrial Research 59: 350–361.

Christoffersen, M.L. (2008a). A catalogue of the Ocnerodrilidae (Annelida, Oligochaeta) from South America. Italian Journal of Zoology 75(1): 97–107; https://doi.org/10.1080/11250000701695250

Christoffersen, M.L. (2008b). Species catalogue and phylogenetic relations of criodriloids and basal glossoscolecoids (Annelida: Clitellata: Lumbricina) from South America. Tropical Zoology 21: 209–226.

Christoffersen, M.L. (2010). Continental biodiversity of South American oligochaetes: The importance of inventories. Acta Zoológica Mexicana (n.s.), Número Especial 2: 35–46.

Csuzdi, C.S. & T. Pavlicek (2009). New records of earthworms from Guadeloupe with description of a new species (Oligochaeta: Glossoscolecidae, Acanthodrillidae, Megascolecidae and Eudrilidae). Opscula Zoologica Budapest 40(1): 9–15.

Das, B.C. & J.W. Reynolds (2003). A checklist and distribution of the fresh water and terrestrial annelida (Oligochaeta, Hirudinea and Polychaeta) of Bangladesh. Megadrilogica 9(10): 61–70.

De Assis, J.E., J.R.B. Souza, M.L.M. Vieira, J.V.N. De Souza, G.G. Rodrigues & M.L. Christoffersen (2017). A catalogue of the Eudrilidae and Megascolecidae (Clitellata: Lumbricina) from South America, with two new records of exotic species from Brazil. Turkish Journal of Zoology 41: 599–614.

Desjardins, T., F. Charpentier, B. Pashanasi, A. Pando-Bahuon, P. Levelle & A. Mariotti (2003). Effects of earthworm inoculation on soil organic matter dynamics of a cultivated utisol. Pedobiologia 47(5–6): 835–841.

Dhiman, N. & S.K. Battish (2006). Earthworms from northern Indian states with Ocnerodrilus occidentalis, Eisen, 1878, as a new report from Punjab. Zoo’s Print Journal 21(1): 2135–2137; http://doi.org/10.11609/JoTT.ZPJ.1203.2135-7

Edwards, C.A. & P.J. Bohlen (1996). Biology and Ecology of Earthworm. Chapman and Hall, London, 426pp.

Fonte, S.J., A.Y.Y. Kong, C. van Kessel, P.F. Hendrix & J. Six (2007). Influence of earthworm activity on aggregate-associated carbon and nitrogen dynamics differs with agro ecosystem management. Soil Biology and Biochemistry 39(5): 1014–1022.

Fonte, S.J., T. Winsome & J. Six (2009). Earthworm populations in relation to soil organic matter dynamics and management in California Tomato cropping systems. Applied Soil Ecology 41: 206–214.

Fragoso, C. & J.W. Reynolds (1997). On some earthworms from central and southeastern Mexican mountains, including two new species of the genus Dichogaster (Dichogastrini). Megadrilogica 7(2): 9–20.

Fragoso, C., S. James & S. Borges (1995). Native earthworms of the north neotropical region: Current status and controversies, pp. 67–115. In: Hendrix, P. (ed.). Earthworm Ecology and Biogeography in North America. Lewis Publishers, Boca Raton, Florida, 256pp.

Gates, G.E. (1972). Burmese earthworms. An introduction to the systematics and biology of megadriles oligochaetes with reference to south-east Asia. Transactions of the American Philosophical Society 62(7): 1–326.

Ghafoor, A. & J.L. Qureshi (1999). Five new records of earthworms from Faisalabad. Pakistan International Journal Agricultural Science 135: 74–75.

Ghosh, A.H. (1993). Earthworm Resources and Vermiculture. Zoological Survey of India. Calcutta, 128pp.

Gobi, M. & G.S. Vijayalashmi (2004). Occurrence of the earthworm Glyphidrillus annandalei in Gadana River, Kalakkada- Mundanthurai Tiger reserve, Tamil Nadu. Zoo’s Print Journal 19(4): 1443; http://doi.org/10.11609/JoTT.ZPJ.1115.1443

Grosso, E., G. Jorge & G.G. Brown (2006). Exotic and native earthworms in various land use systems of central, southern and eastern Uruguay. Caribbean of Science 42(3): 294–300.

Hendrix, P.F., B.R. Mueller, R.R. Bruce, G.W. Langdale & R.W. Parmelee (1992). Abundance and distribution of earthworms in relation to landscape factors on the Georgia Piedmont, U.S.A. Soil Biology and Biochemistry 24: 1357-1361; http://doi.org/10.1016/0038-0717(92)90118-H

Ho, Y.C., K.Y. Show, X.X. Guo, I. Norli, F.M.A. Abbas & N. Morad (2012). Industrial waste- Industrial discharge and their effect to the environment. In: Prof. Kuan-Yeow Show (ed.). In: Tech, Available from: http://www.intechopen.com/books/industrial-waste/industrial-emissions-and-their effect-on-the-environment.

Hobblen, P.H.F., J.E. Koolhaas & C.A.M.V. Gestel (2006).

Bioaccumulation of heavy metals in the earthworms Lumbricus rubellus and Aporrectodea caliginosa in relation to the total and available metal concentrations in field soils. Environmental Pollution 144: 639–646.

Hook, R.I. (1974). Cadmium, Lead and Zinc distributions between earthworms and soils: Potential for biological accumulation. Bulletin of Environmental Contamination and Toxicology 2: 509–512.

Huerta, E., J. Rodriguez-Olan, I. Evia-Castillo, E. Montejo-Meneses, M. de la Cruz-Mondragón, R. Garcia-Hernandez & S. Uribe (2007). Earthworms and soil properties in Tabasco, Mexico. European Journal of Soil Biology 43: 190–195; http://doi.org/10.1016/j.ejsobi.2007.08.024

Iordache, M. & I. Borza (2010). Relation between the chemical indices of soil and earthworm abundance under chemical fertilization. Plant Soil Environment 56: 401–407.

Ishtiya, A.N. & B.K. Anish (2011). Earthworm communities of Kashmir Valley, India. Tropical Ecology 52(1): 151–162.

Jackson, M.L. (1973). Soil Chemical Analysis. Prentice Hall of India. New Delhi, 521pp.

James, S.W. (2004). New species of Amynthas, Pheretima and Pleionogaster (Clitellata: Megascolecidae) of the Mt. Kitanglad range, Mindanao Island, Philippines. The Raffles Bulletin of Zoology 52(2): 289–313.

Jamieson, B.G.M. & J.E. Wampler (1979). Bioluminescent Australian earthworms II. Taxonomy and preliminary report of bioluminescence in the genera in the genera Spenceriella, Fletcherodrilus and Pontodrilus (Megascolecidae: Oligochaeta). Australian Journal of Zoology 27: 637–639.

Jones, C.G., L.H. Lawton & M. Shachak (1994). Organisms as ecosystem engineers. Oikos 69: 373–386.

Joshi, N. & S. Aga (2009). Diversity and distribution of earthworms in a subtropical forest ecosystem in Uttarakhand, India. The Natural History Chulalongkorn University 9(1): 21–25.

Joshi, N., M. Dabral & R.K. Maikhuri (2010). Density, biomass and species richness of earthworms in agro-ecosystems of Garhwal Himalaya, India. Tropical Natural History 10(2): 171–179.

Julka, J.M. (1983). A new genus and species of earthworm (Oligochaetidae: Oligochaeta) from south India. Geobios 2: 48–50.

Julka, J.M. (1988). The Fauna of India and The Adjacent Countries: Megascolecidae (Earthworms) - Haplotaxida: Lumbricina: Megascolecidea: Octochaetidae. Zoological Survey of India, Calcutta, 400pp.

Julka, J.M. (2008). Know Your Earthworms. Foundation for Life Sciences and Business Management, Solan, 51pp.

Julka, J.M. (2014). Diversity and distribution of exotic earthworms (Annelida, Oligochaeta) in India a review, pp. 73–83. In: Chaudhuri, P. & S.M. Singh (eds.). Biology and Ecology of Tropical Earthworms. Discovery Publishing House, New Delhi.

Kale, R.D. & N. Karmegam (2010). The role of earthworms in tropics with emphasis on Indian ecosystems. Applied and Environmental Soil Science 2010: 1–16; http://doi.org/10.1155/2010/414356

Kale, R.D. & R.V. Krishnamoorthy (1978). Distribution and abundance of earthworms in Bangalore. Proceedings of the Indian Academy of Sciences-Section B, Animal Sciences 87(3): 23–25.

Kathireswari, P., J.M. Julka & J. Ramasamy (2008). Biodiversity and earthworm species of Coimbatore forest division, the Western Ghats, Tamil Nadu, India. Megadrilogica 12(8): 120–124.

Kathireswari, P., J.M. Julka & J.W. Reynolds (2005). Checklist of oligochaeta of Tamil Nadu, India. Megadrilogica 10(8): 57–68.

Kaushal, B.R. & S.P.S. Bishat (1994). Population dynamics of the earthworm Amynthas alexandri (Annelida: Megascolecidae) in Kumaun Himalayan pasture soil. Biology and Fertility of Soils 17: 9–13.

Krishnamurthy, R.V. & S. Ramachandra (1988). Population structure of earthworms in woodlands of Karnataka. Proceedings of the Indian Academy of Science (Animal Science) 97(4): 355–365.

Laura, C.A. & I.C. Ines (2001). The distribution and ecology of littoral oligochaeta and aphanophoneura (Annelida) of the natural and historical reserve of Isla Martin Garcia, Rio de la Planta River, and Argentina. Hydrobiologia 463: 207–216.

Lavelle, P., M. Dangerfield, C. Fragoso, V. Eschenbrenner, D. Lopez-Hernandez, B. Pashanasi & L. Brussaard (1994). The relationship between soil macrofauna and tropical soil fertility, pp. 137–169. In: Swift, M.J. & P.L. Woomer (eds.). The Biological Management of Tropical Soil Fertility. John Wiley-Sayce, New York, 252pp.

Lee, K.E. (1985). Earthworms: Their Ecology and Relationships with Soils and Land Use. Academic Press, New York, 411pp.

Mihailova, P. (1964). Five species Lumbricidae (Oligochaeta) new to the fauna of Bulgaria. Annuaire de Universite de Sofia 58: 169–171.

Mihailova, P. (1966). Lumbricidae (Oligochaeta) earthworms in Thrace. Fauna of Thrace 3: 181–200.

Mischis, C.C. (1992). The first record of the species Amynthas diffringens (Baird, 1869) (Oligochaeta: Megascolecidae) in the province of Cordoba (Argentina). Megadrilogica 4: 143–144.

Mischis, C.C. (1993). A contribution to the knowledge of megascolecid fauna (Annelida, Oligochaeta) from the Province of Córdoba, Argentina. Megadrilogica 5: 9–12.

Mischis, C.C. & A.M. Brigada (1985). The earthworms (Annelida,Oligochaeta) from the Province of San Luis (Argentina). Part I. Megadrilogica 4(5): 133–134.

Mischis, C.C. & G. Righi (1999). Contribution to knowledge of the oligochaete fauna (Annelida, Oligochaeta) from Argentina. Gayana 63: 11–13.

Monroy, F., M. Aira, J. Dominguez & F. Morino (2003). Distribution of earthworms in the north-west of the Iberian Peninsula. European Journal of Soil Biology 39(1): 13–18.

Mora, P., E. Miambi, J.J. Jimenez, T. Decaens & C. Rouland (2005). Functional complement of biogenic structures produced by earthworms, termites and ants in the neotropical savannas. Soil Biology and Biochemistry 36(6): 1043–1048; http:// doi.org/10.1016/j.soilbio.2004.10 019

Narayanan, S.P., S. Sathrumithra, G. Christopher, A.P. Thomas & J.M. Julka (2016). Current distribution of the invasive earthworm Pontoscolex corethrurus (Muller, 1857) after a century of its first report from Kerala state, India. Opscula Zoologica Budapest 47(1): 101–107; http://doi.org/10.18348/opzool.2016.1.101

Narayanan, S.P., S. Sathrumithra, G. Christopher, & J.M. Julka (2017). New species and new records of earthworms of the genus Drawida from Kerala part of the Western Ghats biodiversity hotspot, India (Oligochaeta, Moniligastridae). ZooKeys 691: 1–18.

Omodeo P. & Е. Rota (1991). Earthworms of Turkey II. Bolletino di Zoologia 58: 171–181.

Oommen, S.K. (1998). Studies on bioprocess of organic soild wastes applying vermitech and the efficacy of vermicompost and vermiwash in soil fertility. PhD Dissertation. Mahatma Gandhi University, 110pp.

Paliwal, R. & J.M. Julka (2005). Checklist of earthworms of Western Himalaya, India. Zoo’s Print Journal 20(9): 1972–1976.

Parmelec, R.W., P.J. Bohlen & J.M. Blair (1998). Earthworms and nutrient cycling processes: Integrating across the ecological hierarchy, pp. 179–211. In: Edwards, C. (ed.). Earthworm Ecology. St. Lucie Press, Boca Raton, Fla, USA, 456pp.

Rajkhowa, D.J., P.N. Bhattacharyya, A.K. Sarma & K. Mahanta (2014). Diversity and distribution of earthworms in different soil habitats of Assam, north-east India, an Indo-Burma biodiversity hotspot. Proceedings of the National Academy of Sciences, India Section B: Biological Sciences 85(2): 389–396.

Rana, S.A., S. Bano & M.J.I. Siddiqui (2002). Species structure of earthworms in various crop field of Gujranwala District. International Journal of Agriculture and Biology 4(3): 350–354.

Rao, B.R.C. (1979). Studies on the biological and ecological aspects of certain Indian earthworms. Karnataka. Mysore University, PhD Dissertation, 242pp.

Reynolds, J.W. (1994). The earthworms of Bangladesh (Oligochaeta: Megascolecidae, Moniligastridae and Octochaetidae). Megadrilogica 5(4): 34–44.

Reynolds, J.W. (2009). Species distribution maps for Gates’ Burmese earthworms and current nomenclature usage. Megadrilogica 13(6): 53–84.

Reynolds, J.W. (2015). A checklist by counties of earthworms (Oligochaeta: Glossoscolecidae, Lumbricidae, Megascolecidae, Ocnerodrilidae and Octochaetidae) in Hawaii, USA. Megadrilogica 19(7): 115–122.

Reynolds, J.W. & C. Fragoso (2004). The earthworms (Oligochaeta: Acanthodrlidae, Eudrilidae, Glossoscolecidae, Lumbricidae, Megascolecidae and Ocnerodrilidae) of Bermuda. Megadrilogica 10(4): 17–26.

Reynolds, J.W. & M.J. Wetzel (2008). Terrestrial oligochaeta (Annelida: Clitellata) in North America, including Mexicana, Puerto Rico, Hawaii and Bermuda. Megadrilogica 12(12): 157–208.

Reynolds, J.W. & M.J. Wetzel (2017). Nomenclatura Oligochaetologica - A catalogue of names, descriptions and type specimens. Editio Secunda. URL: http://www.inhs.illinois.edu/people/mjwetzel/nomenoligo.

Reynolds, J.W., C. Fragoso & C.A.Guerra (1995a). New earthworm records from Belize (Ologochaeta: Acanthodrilidae, Eudrilidae, Glossoscolecidae, Megascolecidae, Ocnerodrilidae and Octochaetidae). Megadrilogica 6(7): 63–70.

Reynolds, J.W., J.M. Julka & M.N. Khan (1995b). Additional earthworm records from Bangladesh (Oligochaeta: Glossoscolecidae, Megascolecidae, Moniligastridae, Ocnerodrilidae and Octochaetidae). Megadrilogica 6(6): 51–64.

Reynolds, J.W., J. Manazhy, A. Manazhy & V. Nair (2010). The great global earthworm race goes to south India. Megadrilogica 13(11): 161–172.

Sathianarayan, A. & A.B. Khan (2006). Diversity, distribution and abundance of earthworms in Pondicherry region. Tropical Ecology 47(1): 139–144.

Shen, H.P. & D.C. Yeo (2005). Terrestrial earthworms from Singapore. The Raffles Bulletin of Zoology 53(1): 13–33.

Shen, H.P., S.C. Tsai & C. Tsai (2005). Occurrence of the earthworms Pontodrilus litoralis (Grube, 1985), Metaphire houlleti (Perrier, 1872) and Eiseniella tetraedra (Savgny, 1826) from Taiwan. Taiwan 50(1): 11–21.

Sherlock, E., S. Lee, S. Mcphee, M. Steer, J.M. Maes & C. Csuzdi (2011). First earthworm collections from Nicaragua with description of two new species (Oligochaeta). Zootaxa 2732: 49–58.

Siddaraju, M., K.S. Sreepada & J.W. Reynolds (2010). Checklist of earthworms (Annelida: Oligochaeta) from Dakshina Kannada, Karnataka south-west coast of India. Megadrilogica 14(5): 65–75..

Singh, R., R.S. Singh, H.S. Purohit, T.P. Verma & R.S. Garhwal (2016). Productivity and suitability evaluation of orange (Citrus reticulata) growing soils of hot and semi-arid region of Rajasthan (AESR 5.2). Journal of the Indian Society of Soil Sciences 64(1): 46–57.

Spiegel, H. (2002). Trace element accumulation in selected bio indicators exposed to emission along the industrial facilities of Danube Lowland. Turkish Journal of Chemistry 26: 815–823.

Springett, J.A., R.A.J. Gray, D.J. Barker, M.G. Lambert, A.D. Mackay & V.J. Thomas (1998). Population density and distribution of the New Zealand indigenous earthworm Octochaetus multiporus (Megascolecidae: Oligochaeta) in hill pastures. Journal of Ecology 22(1): 87–93.

Stephenson, J. (1923). Oligochaeta fauna of British India including Ceylon and Burma. Taylor and Francis, London, 518pp.

Stojanovic, M., R. Tsekova & T. Milutinovic (2012). Earthworms (Oligochaeta: Lumbricidae) of Bulgaria: diversity and biogeographical review. Acta Zoologica Bulgarica 4: 7–15.

Stojanovic, M., R. Tsekova, S. Pesic, J. Milanovic & T. Milutinovic (2013). Diversity and a bio-geographical review of the earthworms (Oligochaeta: Lumbricidae) of the Balkan Mountains (Stara Planina Moutains) in Serbia and Bulgaria. Turkish Journal of Zoology 37: 635–642.

Suthar, S., S. Singh & S. Dhawan (2008). Earthworms as bio indicator of metals (Zn, Fe, Mn, Cu, Pb, and Cd) in soils: Is metal bioaccumulation affected by their ecological category? Ecological Engineering 32: 99–107; http://doi.org/10.1016/j.ecoleng.2007.10.003

Tripathi, G. & P. Bharadwaj (2004). Earthworm diversity and habitat preferences in arid regions of Rajasthan. Zoo’s Print Journal 19(7): 1515–1519; http://doi.org/10.11609/JoTT.ZPJ.1074.1515-9

Tsai, C.F., H.P. Shen & S.C. Tsai (2000). Native and exotic species of terrestrial earthworm (Oligochaeta) in Taiwan with reference to north-east Asia. Zoological Studies 39(4): 285–294.

Tsai, C.F., H.P. Shen & S.C. Tsai (2004). Endemicity and altitudinal stratification in distribution of megascolecidae earthworms in the centro-western Taiwan. Endemic species 6(2): 1–18.

Werner, M.R. & D.L. Dindal (1989). Earthworm community dynamics in conventional and low input agro-ecosystems. Revue D’ Ecologieet de Biologie du Soil 26: 427–437.